1. Department of Pediatrics; Prince of Songkla University; Hat Yai Songkhla Thailand
2. Department of Orthopedic Surgery and Physical Medicine; Prince of Songkla University; Hat Yai Songkhla Thailand
3. Epidemiology Unit; Faculty of Medicine; Prince of Songkla University; Hat Yai Songkhla Thailand
4. Department of Pediatrics; Medical Education Center Songkhla Hospital; Songkhla Thailand
5. Department of Pediatrics; Medical Education Center Hatyai Hospital; Hatyai Thailand Songkhla
6. Department of Pediatrics; Medical Education Center Trang Hospital; Trang Thailand
7. Pediatric Unit; Phatthalung Hospital; Phatthalung Thailand